Chalcogenides are a class of materials that contain one or more elements from the chalcogen group of the periodic table, which includes sulfur, selenium, and tellurium. These materials have unique electronic, optical, and chemical properties that make them of interest for a wide range of applications, including optoelectronics, photovoltaics, and data storage devices. Researchers study chalcogenides to understand and exploit their properties for various technological applications. The study of chalcogenides involves a combination of experimental techniques, such as synthesis and characterization, as well as theoretical modeling to predict and understand their behavior at the atomic and electronic levels.